EP7 Sonic Defenders Ultra earplugs protect your hearing against Noise Induced Hearing Loss NIHL without interfering with your ability to hear routine sounds or conversations. Their foamtipped stem design featuring soft memoryfoam Comply Canal Tips fits most people and provides a Noise Reduction Rating NRR of 28 dB. Sounds at safe levels are allowed to pass through into the ear canal while potentially harmful noises above 85 dB are reduced via a proprietary design that incorporates a special noisereducing filter. EP7s include attached filter caps which can be inserted for additional protection and blocking out lowerlevel noise in situations where hearing ambient sounds or conversations isnt critical.